This document discusses CrossFit and the attributes of those who practice it. It defines a "firebreather" as someone who faces physical challenges with determination and optimism like an athlete. It notes CrossFit had over 10,000 affiliates by July 2014 and that practitioners believe their fellow gym members would survive a zombie apocalypse. It discusses concepts like mental toughness, strength over thinness, ritual in sports, and making every workout a challenge to overcome.